Friction draft-gear.



Nm 740,3;4. PATENTED SEPT. 29, 1903. J; ffmms. Human DRAFT GEAR.

APPLIATION FILED JUNI-1 17, 19024 s SHEETS-SHEET 1.

H0 MODEL.

MTNESSE5\ PATENTBD SEPT. 29, 1903.

J. TIMMS. FRIGTION DRAFT GEAR.

3 SHEBT-SHBE'I 2,

APPLICATION TILBD JUNE 17| 1902.

NO MODEL.

PATENTEB SEM; 29, 1903.

4J. TIMMS. PRIGTION DRAFT GEAR. APPLICATION FILED JUNE; 17, 1902.

E' SHEETS-SHEET 3.

N0 MODEL.

WW y

JAMES TIMMS, OF COLIIMBUS, OHIO,

Patented September 29, 190.

PATENT OFFICE.

ASSIGNOR TO THE BUCKEYE MALLE' ABLE IRON & OOUPLER COMPANY, OF COLUMBUS, OHIO.

FRICTION DRAFT-G EAR.

SPECIFICATION forming part of Letters Patent No. 740,334, dated September 29, 1903.

yApplication iiled June 1'7, 1902. Serial No. 112,095. (No model.)

To @ZZ whom-it may concern:

Beit known that l, JAMES TIMMS, of'Columbus, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Friction Draft-Gear; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

-My invention relates to an improvement in friction draft-gear and buiiing apparatus for railroad-cars; and it consistsv in a case inclosing two independent sets of frictional parts and an intermediate spring' pressing them in opposite directions.

My invention further consists in a case inclosing two independent sets of longitudinally-moving parts, an intermediate spring pressing the parts in opposite directions, and means for creating friction between the case and the parts within the case.

In the accompanying drawings, Figure 1 is a view in longitudinal vertical section ofmy improved gear, the straps being shown in elevation. Fig. 2 is a plan view, i the case and strap being broken away. Fig. 3 is a view in transverse section on the line A B of Fig. 3. Fig. 4 is a similar view on the line O D of Fig.'3. Figs. 5., 6, and 7are views of the inner followers. Figs.'8, 9, and 10 are views of the outer followers. Figs. 1'1, 12, and 13V are views of the wedges, and Figs. 14 and 15 are views of the straps. y

l represents the friction-gear case, rectangular in shape and open at its ends. This case is firmly and rigidly secured to the cartimbers, as shown in Figs. 3 and 4, and is provided internally with shoulders 2, which latter form abutments for the inner followers 3 and 4f. These followers each have inclined or beveled outer faces 5, the edges of which normally rest against' the abutments 2 and limit the outward movement or separation of the followers. f These shoulders are located approximately equal distances from the transverse center of thecase, so that the case is divided bythe followers 3 and et into a centrai compartment and twoend compartments, the former of which is occupied by the springs 5 and 6, while the two end compartments carry the friction devices. The two followers 3 and 4 are each provided on their inner or adjacent faces with a circular seat 7 for the larger spring 6, While a smaller inner spring is seated at its vends against the followers within the seats 7, smaller springs 5 being also `located at the four corners of the followers, as shown in Figs. 1 and 3. By this construction the spring-seats are arranged in .dierent planes, so that springs of dierent lengths may be used. l

Each follower 3 and i has two of its opposite side edgescut away, as shown at 8 in Fig. 8, for the passage-of the straps 16, to be hereinafter referred to, and is provided Yon its remaining opposite side edges with inwardlyprojecting lugs 9, which, together with the straps,preven't any lateral movement of the larger spring-6 and which also operate as stops to limit the compression of the springs. The outer faces of the followers are beveled or inclined, as shown in Figs. 5 6, and '7, the four dat faces of each pyramid each forming a seat or bearing for theinclined innerface 10 of a wedge 11. lEach wedge has a flat outer face, and when, the four edges of each pair of followers are assembled and in contact with the followers they form a rectangular body having rightangle sides which fits snugly within its compartment in the casing. The inner face of the'portions of the casing occupied by the wedges is lined with a wearing-face 12, of hardened metal, against which the wedges 11 bear and move, and the two wedges of each friction-compartment adjacent to the straps 16 are cut away, as shown movement of said straps.

Each wedge 11 is substantially triangular in cross-section at its greatest diameter, so that when assembled they form a rectangular body made up of sections, each having a shallow conical depression at its inner end or its end adjacent to the springs for the reception of the bevel-faces on the followers 3 and 4,

at 13, for the free -While the outer end of each sectional rectangular body, which, as before stated, is composed Vof the four wedges, is provided with deeper or longer depressions for the reception of the pyramidal inner faces 14 on the outer followers 15. These followers are arand the inner and outer followers ICO ranged at the ends of the. casing with their pyramids pointing inwardly and seated within the outer recesses formed by the assembled Wedges. Extending through the casing 1 and passing through the slots 13 in the outer followers, two of the wedges of veach set, and the inner followers are thestraps 16. These straps 16 are ben-t at their rear endsand anged for attachment to each other in rear of the rear follower and are connected at their front ends to the draw-bar 17 of the coupling.

The rear end of the draw-bar of the coupling rests against the front face of the front follower, while the bent ends of the straps 16 engage the outer face of the rear follower. From this it will be seen that under a pulling` strain the straps 16, straddling the rear follower, force it forwardly, the pyramid thereon forcing the wedges inwardly or forwardly toward the springs and also outwardly toward the case, the rearwardly projecting pyramid on the inner follower also tending to expand the wedges. The inner follower 4 is free to move forwardly, while the follower 3 is restrained against forward movement by.

tion sufficient to prevent vibrations of the' spring, the friction increasing in proportion to the load. v v

In bufflng, the inner follower 4 will be held against its shoulders 2, while the follower 3 will be free to move rearwardly against the springs, cones on the inner follower 3 and its outer companion follower forcing the wedges between them into contact with the four sides of the casing or the lining 12 within the casing, thus producing sufcient friction to prevent any vibrations of the spring.

The springs located intermediate the friction parts tend to force the latter in opposite directions when the parts are at rest, and thus relieve the friction between the wedges and the casing. When, however, the springs are compressed by either a pulling or a bulfing strain, one set of friction devices by their 4engagement with the casing produces sufficient friction to prevent any vibrations in the springs and consequent vibrations of the followers.

It is evident that changes in the construction and relative arrangement of the several parts might be made without avoiding my invention, and hence I would have it understood that I do not restrict myself to the particular construction and arrangement ofparts shown and described; but,

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a friction draft-gear and bufting apparatns, the combination of a case having friction surfaces parallel with the line of draft, two independent sets of frietional elements within the case, parts of said sets of frietional elements adapted to be moved outwardly to engage the friction-surfaces of the case, and an intermediate spring for pressng the sets of friction parts in opposite directions.

2. In a friction draft-gear and buffing apparatus, the combination of a case having friction surfaces parallel with the line of draft, two independent sets of longitudinallymovable parts within the case, an intermediate spring pressing the parts in opposite directions, and means for. creating friction between the parallel faces of the case and the parts within the case.

3. In a friction draft-gear and bufting ap-Y paratus, the combination of a stationary case having friction-faces parallel with the line of draft, two independent sets of frietional parts within the case, an intermediate spring pressing the frietional parts in opposite directions, and opposite wedge-shaped surfaces that contact with the frietional parts to force them against the parallel surfaces of the case.

4. In a friction draft-gear and bung apparatus, the combination of a stationary case having friction-surfaces parallel with the line of draft, independent frietional parts within the case, a spring pressing the frietional parts in opposite directions, and wedge-shaped surfaces between the ends of the spring and the frietional parts for for'cing 4the latter .outwardly against the parallel frietional surfaces of the case.

5. In a friction draft-gear and bulng apparatus, the combination of a stationary case having friction-surfaces parallel with the line of draft, independent movable parts within the case, a spring pressing the movable parts in opposite directions and central Wedgeshaped surfaces formed on the front and rear follower-plates that move'the parts longitudinally and press them against the parallel IOO IIO

surfaces of the case to create friction, substantially asset forth.

6. In a friction draft-gear and bufting apparatus, the combination of a case having friction-faces parallel with the line of draft, independent movable parts within the case, followers having oppositely-located wedgeshaped surfaces for forcing the movable parts outwardly against the parallel surfaces of the case, a spring between the inner followers and lugs on the inner followers for limiting follower-plates having spring-seats on different planes, substantially'as set forth.

9. In a friction draft-gear and bnffing apparatus, the combination of friction elements, means for creating friction between the friction elements, resisting-sprin gs and a followerplate having spring-seats on different planes, substantially as set forth.

l0. In a friction draft-gear andV buing apparatus, the combination of friction elements, of resisting-springs, and a follower-plate at each end of the spring, having spring-seats on different planes formed on oneface and a central wedge-shaped surface on the opposite face, substantially as set forth.

11. In a friction draft-gear and buffing apparatus, the combination of friction elements, of resisting-springs, and a follower-plate at each end of the spring and having Va central wedge form on oneface, spring-seats on different planes and projecting lugs that limit the compression of the springs on the opposite faces, substantially as set forth.

12. In a'friction-gear, the combination of yielding spring-abutments said spring-abutments having reversely-arranged outwardlyinclined faces, of a plurality of oppositelydisposed relatively movable f riction elements having 'friction-faces parallel to the line of applied force and inclines corresponding with the inclines of the springabntments with which they engage, a friction element which coacts with the oppositely-disposed relatively movable friction elements, aspringinterposed between said spring-abutments, and a transmission element arranged to alternately actuate the oppositely-disposed relatively movable friction elements, substantially as and for the purposes specified.

13. In a friction .draft-gear, the combination with a housing having on its interior friction-faces parallel to the line of draft, of a plurality of relatively movable friction elements which simultaneously act as friction elements and as followers and which have a frictionface parallel to the line of draft and a face inclined thereto, a plurality ofspring-abutments lineally movable in the line of draft and having inclined. faces corresponding to the inclined faces of the relatively movable friction elements, and a spring interposed between said spring-'abutment'.s, substantially as and for the purposes specified.

14. In a friction draft-gear and buffrng apparams, the combination of a case having W. A. MARSH, C. E. ROTH. 

